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author | Akinobu Mita <akinobu.mita@gmail.com> | 2009-12-15 16:48:31 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 07:20:21 -0800 |
commit | 243797f59b748f679ab88d456fcc4f92236d724b (patch) | |
tree | d21ffa61ee1a34cf512133fe05940bfbd0e0c163 /lib | |
parent | 81f6527bd322ef1f3a58c2c438b9ded3bd8f606a (diff) | |
download | linux-243797f59b748f679ab88d456fcc4f92236d724b.tar.gz linux-243797f59b748f679ab88d456fcc4f92236d724b.tar.xz |
genalloc: use bitmap_find_next_zero_area
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r-- | lib/genalloc.c | 33 |
1 files changed, 12 insertions, 21 deletions
diff --git a/lib/genalloc.c b/lib/genalloc.c index eed2bdb865e7..e67f97495dd5 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -11,6 +11,7 @@ */ #include <linux/module.h> +#include <linux/bitmap.h> #include <linux/genalloc.h> @@ -114,7 +115,7 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) struct gen_pool_chunk *chunk; unsigned long addr, flags; int order = pool->min_alloc_order; - int nbits, bit, start_bit, end_bit; + int nbits, start_bit, end_bit; if (size == 0) return 0; @@ -129,29 +130,19 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) end_bit -= nbits + 1; spin_lock_irqsave(&chunk->lock, flags); - bit = -1; - while (bit + 1 < end_bit) { - bit = find_next_zero_bit(chunk->bits, end_bit, bit + 1); - if (bit >= end_bit) - break; - - start_bit = bit; - if (nbits > 1) { - bit = find_next_bit(chunk->bits, bit + nbits, - bit + 1); - if (bit - start_bit < nbits) - continue; - } - - addr = chunk->start_addr + - ((unsigned long)start_bit << order); - while (nbits--) - __set_bit(start_bit++, chunk->bits); + start_bit = bitmap_find_next_zero_area(chunk->bits, end_bit, 0, + nbits, 0); + if (start_bit >= end_bit) { spin_unlock_irqrestore(&chunk->lock, flags); - read_unlock(&pool->lock); - return addr; + continue; } + + addr = chunk->start_addr + ((unsigned long)start_bit << order); + + bitmap_set(chunk->bits, start_bit, nbits); spin_unlock_irqrestore(&chunk->lock, flags); + read_unlock(&pool->lock); + return addr; } read_unlock(&pool->lock); return 0; |